77307242887 has 4 divisors (see below), whose sum is σ = 88351134736. Its totient is φ = 66263351040.

The previous prime is 77307242863. The next prime is 77307243037. The reversal of 77307242887 is 78824270377.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77307242887 - 2²³ = 77298854279 is a prime.

It is a super-2 number, since 2×77307242887² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77307242827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5521945914 + ... + 5521945927.

It is an arithmetic number, because the mean of its divisors is an integer number (22087783684).

Almost surely, 2^77307242887 is an apocalyptic number.

77307242887 is a deficient number, since it is larger than the sum of its proper divisors (11043891849).

77307242887 is a wasteful number, since it uses less digits than its factorization.

77307242887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11043891848.

The product of its (nonzero) digits is 7375872, while the sum is 55.

The spelling of 77307242887 in words is "seventy-seven billion, three hundred seven million, two hundred forty-two thousand, eight hundred eighty-seven".